mirror of https://github.com/tc39/test262.git
56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-proxy-object-internal-methods-and-internal-slots-defineownproperty-p-desc
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description: >
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If "defineProperty" trap is null or undefined, [[DefineOwnProperty]] call
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is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
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info: |
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[[DefineOwnProperty]] (P, Desc)
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[...]
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5. Let target be O.[[ProxyTarget]].
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6. Let trap be ? GetMethod(handler, "defineProperty").
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7. If trap is undefined, then
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a. Return ? target.[[DefineOwnProperty]](P, Desc).
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features: [Proxy, Reflect]
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includes: [compareArray.js]
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---*/
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var array = [];
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var arrayTarget = new Proxy(array, {});
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var arrayProxy = new Proxy(arrayTarget, {
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defineProperty: undefined,
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});
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Object.defineProperty(arrayProxy, "0", {value: 1});
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assert.compareArray(array, [1]);
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assert.throws(TypeError, function() {
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Object.defineProperty(arrayProxy, "length", {
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get: function() {},
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});
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});
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var trapCalls = 0;
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var target = new Proxy({}, {
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defineProperty: function(_target, key) {
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trapCalls++;
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return key === "foo";
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},
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});
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var proxy = new Proxy(target, {
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defineProperty: undefined,
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});
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assert(Reflect.defineProperty(proxy, "foo", {}));
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assert.sameValue(trapCalls, 1);
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assert.throws(TypeError, function() {
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Object.defineProperty(proxy, "bar", {});
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});
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assert.sameValue(trapCalls, 2);
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